Test your limits at the Seven Sisters Skyline, an elite mountain running challenge set in the breathtaking Derryveagh Mountains of Donegal. As the most challenging mountain race in Ireland, this 55km course features a demanding 4,000m elevation gain, navigating through stunning landscapes that showcase Donegal’s rugged beauty. Starting from the village of Dunlewey, nestled at the foot of Mount Errigal, this exhilarating route takes you through the majestic Seven Sisters mountain range, including notable peaks like Errigal and Muckish. Each mountain presents its own unique set of challenges, pushing your endurance and spirit to new heights amidst the allure of Ireland's northernmost region.